// 调用wifi库
#include <ESP8266WiFi.h> 
// 替换为你的wifi名称和密码
const char* ssid = "qmw";//wifi名称
const char* password = "zhengnengliang";//wifi密码
// 设置web服务器端口为80
WiFiServer server(80);
// 定义储存HTTP请求的变量
String header;
// 定义储存当前输出状态的变量
String output5State = "off";
String output4State = "off";
// 定义输出引脚连接
const int output5 = 5;//esp8266的IO口5,既D1
const int output4 = 2;//esp8266的IO口2,既D4

void setup() {Serial.begin(115200);
// 设置引脚为输出模式
pinMode(output5, OUTPUT);
pinMode(output4, OUTPUT);
// 将引脚输出初始化为低
digitalWrite(output5, LOW);
digitalWrite(output4, LOW);
// 通过wifi名称和密码连接网络
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// 串口打印网站的IP地址，并启动服务器
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data 
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read 
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// turns the GPIOs on and off
if (header.indexOf("GET /5/on") >= 0) {
Serial.println("GPIO 5 on");
output5State = "on";
digitalWrite(output5, HIGH);
} else if (header.indexOf("GET /5/off") >= 0) {
Serial.println("GPIO 5 off");
output5State = "off";
digitalWrite(output5, LOW);
} else if (header.indexOf("GET /4/on") >= 0) {
Serial.println("GPIO 4 on");
output4State = "on";
digitalWrite(output4, HIGH);
} else if (header.indexOf("GET /4/off") >= 0) {
Serial.println("GPIO 4 off");
output4State = "off";
digitalWrite(output4, LOW);
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons 
// Feel free to change the background-color and font-size attributes
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #77878A;}</style></head>");// Web Page Heading
client.println("<body><h1> WIFI开关 </h1>");
// Display current state, and ON/OFF buttons for GPIO 5 
client.println("<p> 开关1状态  " + output5State + "</p>");//client.println("<p>GPIO 5 - State " + output5State + "</p>");
// If the output5State is off, it displays the ON button 
if (output5State=="off") {
client.println("<p><a href=\"/5/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/5/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 4 
client.println("<p>开关2状态  " + output4State + "</p>");//client.println("<p>GPIO 4 - State " + output4State + "</p>");
// If the output4State is off, it displays the ON button 
if (output4State=="off") {
client.println("<p><a href=\"/4/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/4/off\"><button class=\"button button2\">OFF</button></a></p>");
}
client.println("</body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = ""; }
} else if (c != '\r') { // if you got anything else but a carriage return character,currentLine += c; // add it to the end of the currentLine
} } }// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
} }
